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                [Usaco2013 Dec]Optimal Milking                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>
<div>
<div>Farmer John最近购买了N(1 &lt;= N &lt;= 40000)台挤奶机，编号为1 ... N，并排成一行。第i台挤奶机每天能够挤M(i</div>
<div>)单位的牛奶 (1 &lt; =M(i) &lt;=100,000)。由于机器间距离太近，使得两台相邻的机器不能在同一天使用。Farmer Jo</div>
<div>hn可以自由选择不同的机器集合在不同的日子进行挤奶。在D(1 &lt; = D &lt; = 50,000)天中，每天Farmer John对某一</div>
<div>台挤奶机进行维护，改变该挤奶机的产量。Farmer John希望设计一个挤奶方案，使得挤奶机能够在D天后获取最多</div>
<div>的牛奶。</div>
</div>
</div>
<p></p></p><hr/><h3>输入格式</h3><p><div>
<div>第1行：两个整数N和D</div>
<div>第2..N+1行：每台挤奶机的M(i)</div>
<div>第N+2..N+D+1行：两个整数i和m，表示每天对机器i进行维护，机器i的产量为m。</div>
<div></div>
</div>
<p></p></p><hr/><h3>输出格式</h3><p><div>
<div>最大产量</div>
</div>
<p></p></p><hr/><h3>样例输入</h3><pre>5 3
1
2
3
4
5
5 2
2 7
1 10</pre><hr/><h3>样例输出</h3><pre>32
【样例解释】
第1天，最优方案为2+4=6  ( 方案1+3+2一样)
第2天，最优方案为7+4=11
第3天，最优方案为10+3+2=15
</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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